Applications of the Mössbauer effect to silicate mineralogy--II. Iron silicates of unknown and complex crystal structures

Details Applications of the Mössbauer effect to silicate mineralogy--II. Iron silicates of unknown and complex crystal structures Applications of the Mössbauer effect to silicate mineralogy--II. Iron silicates of unknown and complex crystal structures

May 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968gecoa..32..547b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 32, Issue 5, pp.547-559

Computer Science

21

Scientific paper

Measurements have been made of the Mössbauer spectra of howieite, deerite and two sapphirines, for which the crystal structures are unknown and zussmanite and the alkali amphibole crocidolite. Computer analyses of the spectral data for each silicate have yielded values for the chemical shift and quadrupole splitting for each doublet in the Mössbauer spectra. These parameters are correlated with those for iron ions in silicates of known crystal structures to give information on the oxidation state, electronic configuration, and co-ordination site of each iron atom in the structures. High spin iron is found in all minerals studied. All minerals except one sapphirine contain at least one structurally distinct type of Fe 2+ ion in sixfold co-ordination, while deerite contains Fe 2+ ions in fourfold co-ordination. Howieite, deerite, and crocidolite contain Fe 3+ in sixfold co-ordination, while sapphirines contain Fe 3+ in fourfold co-ordination. Computer calculated areas in the Mössbauer spectra have been used to estimate the fraction of each iron species in a structure giving rise to absorption, assuming that the area under a peak is directly proportional to the amount of iron in a site. The results for Fe 2+ and Fe 3+ containing minerals agree well with chemical analysis values. The area data has allowed Fe 2+ site populations to be determined in the crocidolite structure.

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